You have some specs missing like motherboard & power supply.If your motherboard supports it and you have the thermal headroom, you can overclock your CPU.You can increase your total memory. If your motherboard supports it, you may be able to use faster memory.You can use an SSD drive for Windows and your core programs.You may be able to run a second video card (crossfire) if your motherboard and power supply will support it (gaming).

Beyond that, you probably would need to start from scratch (3rd Generation i7 based build).

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